Double-drum hoist



June 30, 1925.

E. B. LEAR DOUBLE DRUM HOIST Filed April 5, 1924' INVENTOR EavLB-Lear Hi5 ATTOR'N Y rows,

Patented June 30, 1925.

UNITED STATES PATENT OFFICE.

EARL B. LEAR, OF PHILLIPSBUBG, NEW JERSEY, ASSIGNOR TO INGEBSOL L-RAND GOM- PANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

DOUBLE-DRUM HOIST.

Application filed April 8, 1824. Serial No. 703,872.

To all whom it may concern:

Be it known that I, EARL B. LEAR, a citizen of the United States, and 'a resident of Phillipsburg, county of Warren, and State of New Jersey, have invented a certain Double-Drum Hoist, of which the following is a specification, accompanied by drawings.

This invention relates to hoists, but more particularly to a power driven hoist of the double drum type, in which either drum may be driven from a common driving shaft.

The objects of this invention are to enable two drums, as for instance, a haulage drum and a tail rope drum, to be driven from a common source of power by improved means and devices which automatically disconnect one drum and connect the other drum to the driving shaft in accordance with the direction of rotation of the shaft.

In accordance with my invention ratchet faces are formed on the opposed faces of the drums and constitute the drivers for the drums. A main driver which rotates with the driving shaft carries a pawl for automatically connecting the main driver to one or the other of the opposed drum drivers in accordance with the direction of rotation of the driving shaft, but in addition to these elements, positive means are provided independent of the opposed drivers for actuating the pawl into engagement with one or the other of the opposed drum drivers. By this means the pawl is positively rocked in a transverse plane to engage one or the other of the opposed drum drivers.

Further objects of the invention will hereinafter appear and to all of these ends the invention consists of the hoist described and claimed in this specification and shown in one of its preferred forms in the accompanying drawings, in which- Figure 1 1s a longitudinal sectional elevation of the hoist taken on the line 11 of Figure 2 looking in the direction of the ar- Figure 2 is a transverse sectional view taken on the line 2-2 of Figure 1 looking in the direction of the arrows, and

Figure 3 is an enlarged detail perspective view of the pawl.

Referring to the drawings, the base plate A upon which the hoist is supported 1s in this instance swivelly mounted on the bed plate B to enable the hoist to be rotatably adjusted in any desired position about a vertical axis. Any suitable motor may be prov ded for the hoist and in this instance a fluid pressure motor is indicated, having a casing C mounted on the base plate A, one end of which casing is closed by a plate D. F lu1d pressure, as for instance compressed an, is sup lied to the motor throu h the su table in ct (not shown) controll by a suitable valve E in the valve chest F adapted to be manipulated by the valve lever G. In this mstance, the motor is assumed to be a reversible motor, the reversal of which is controlled by the valve lever G.

A center bearing H shown in this instance as a tubular support in the form of a shell, is supported at one end in the gear box J and is secured thereto by the center bearing retaining screw K which secures the center bearing to the inner wall of the gear box J. The gear box cover L is secured to the gear box J by means of bolts 0. The construction of the motor and frame so far described has a mimmum of arts, is strong and compact, easily assem led and dis-assembled, and permits ready accessibility to the operative parts of the hoist.

A driving shaft P passing longitudinally through the center bearing H is supported at one end in the antifriction bearing Q and is connected to be rotated b the motor in any suitable manner. A driving pinion R is preferably keyed to the driving shaft P and meshes with an intermediate gear S journaled on the counter shaft T mounted 1n the gear box J. The intermediate gear S is provided with bearings U and V and an intermediate pinion W in this instance forms a portion of the intermediate gear S and meshes with an internal gear X of the main driver Y preferabl in the form of a hollow rotatable shaft a apted to rotate on the center bearing H. Power is taken from the main driver for driving either one of the two drums Z and a loosely mounted relative to the main driver Y and rotatable about the drivin shaft P. It will thus be seen that the main driver Y is connected as by means of gearin to the main driving shaft P and one of t e drums w is conveniently journaled on the center bearing H.

The haulage drum a, to which one length of the cable 6 is adapted to be connected, rotates preferably upon a bushing 0 upon the center bearing H and the tail rope drum Z which is in thls instance mounted beside the drum (1: in line therewith and to which the tail rope d is connected, preferably rotates upon the main driver Y as a convenient and compact construction. Such construction of the drums materially reduces the over-all length of'the hoist and produces a compact and well balanced hoist. Although one of the drums is shown journaled on the center bearing and the other drum journaled upon the main driver, it is to be understood that this construction is merely shown for illustrative purposes and as this arrangement forms no part of the present invention, this invention is not limited to the construction shown except as defined by the appended claims.

Means are provided for automatically connecting the main driver Y to one or the other of the drums Z and a in accordance with the direction of rotation of the driving shaft P and for this purpose the haulage drum a is provided with a driver having clutch members in the form of teeth 6. The teeth a are in this instance shown formed on a flange f of the drum a but it is to be understood that they may be formed on a member separate from the drum a if desired and suitably secured thereto. The tail rope drum Z is likewise provided with a driver having clutch members in the form of teeth 9 formed on the drum flange 71 but facing in the opposite direction from the teeth a.

A pawl carrier in this instance comprises a pair of annular plates or idlers j and k which are adapted to rotate relative to the center bearing H. The idler j in this instance bears directly on the center bearing H and the idler k in this instance bears on the main driver Y. Pins 0 hold the idlers j and 7a in separated relationship and a pawl 72 is in this instance pivotally mounted on one of the pins 0. The pawl is preferably formed with opposed engaging surfaces 9 and 1- which are adapted to engage a tooth e or g on the drums at and Z respectively, in accordance with the direction of rotation of the driving shaft 1 and consequent rotation of the main driver Y. Although but one pawl is shown on the drawings, it is to be understood that as many pawls as necessary may be used and each pawl is adapted to rock vertically about a pin 0 and when one of the engaging surfaces 9 and 1' engage a tooth'on one or the other of the drums, the opposite engaging surface is out of engagement. In this manner, when one drum is being driven the other drum is free to rotate independently thereof.

In order to actuate the pawl p into engagement with a tooth on one or the other of the drum drivers, the pawl 79 is preferably formed with a substantially V-shapcd groove .9 in its under face and a finger or in fixed relationship. Although in this instance the recess 8 is formed in the pawl and the finger or cam t is shown formed 1n the annular ring u, it is to be understood that the recess may be formed in the ring and the cam formed on the pawl, if

desired.

In order to exert a braking or checking effect on the center bearing H for holding the plate or idler k of the'pawl carrier stationary momentarily, a recess w is formed in the plate 70 and a friction shoe a2 having a guiding projection y bears against the center bearing H. The guiding projection g of the friction shoe w extends into an aperture z in the plate 72 and a coil spring 2, which bears against the pin 0 at one end and against the projection 1 at the opposite end, forces the friction shoe 00 against the center bearing H.

In the operating of the hoist so far described, if it be assumed that the driving shaft P is being rotated in the direction of the arrows 3 in Figure 2 the main driver Y will be rotated through the train of gearing described in the direction of the arrow 4 in Figure 2 and the cam 15, which is carried by the annular ring 14, will bear against one side of the V-shaped recess a of the pawl p and positively move the pawl into engagement with one of the teeth (5 and thereby drive the drum a in a counter clockwise direction. It will be seen that the entire driving power is transmitted directly from the cam t to the pawl p and the pawl carrier merely serves to carry the pawl and receives no part of the driving thrust.

Upon reversal of the direction of rotation of the driving shaft P the direction of rotation of the main driver Y will be reversed and the cam t on the annular ring u will positively rock the pawl 79 so that the engaging surface 1' will be rocked into engagement with a tooth g on the drum Z. The friction shoe :1: will hold the plates or idlers j and 7c of the pawl carrier stationary momentarily in order to permit the cam t to rock the pawl p into engagement with a tooth on one or the other of the drum drivers before the driving power is transmitted from the main driver to one or the other of the drums. Whenever the direction of rotation of the driving shaft P is reversed, the pawl carrier is held stationary momentarily to permit the cam t to rock the pawl p into engagement with a tooth on one or the other of the drums and thereafter the pawl carrier, pawl, annular ring at and cam t rotates as a unit about the driving shaft P. One drum or the other will thus be automatically connected to the main driver Y from the driving shaft as often as the direction of rotation of the driving shaft is reversed.

In a hoist of this character, a brake is preferably provided for the drums but in this instance I have shown a brake applied to each of the drums. The haulage drum a may be conveniently provided with a flange 5-to which a. brake band 6 is applied, being controlled by any suitable mechanical connection from a brake lever 7. The actual' mechanical connection between the brake lever 7 and brake band 6 is not shown in the drawing as it forms no part of the present invention. Similarly a brake band 8 is applied to a flange 9 on the tail rope drum Z and is suitably connected to be operated by a brake lever 10.

I claim:

1. In a hoist, the combination of a frame, a driving shaft, two drums rotatable about said driving shaft, a motor connected to operate said driving shaft, opposed drivers carried by said drums respectively, a main driver connected to be rotated by the driving shaft, a transversely rocking pawl associated with said main driver for automatically connectin said main driver to one or the other of sai opposed drivers in accordance with the direction of rotation of the driving shaft, and positive means including a cam independent of the opposed drivers for rocking said pawl into engagement with one or the other of said opposed drivers.

2. In a hoist, the combination of a frame, a driving shaft, two drums rotatable about the driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by 'said drums respectively, a main driver connected to be rotated by the driving shaft, a pawl carrier rotatable about said driving shaft, a rocking pawl pivoted to said carrier forautomatically connecting said main driver to one or the other of said opposed drivers in accordance with the direction of rotation of the driving shaft, positive means on said main driver for actuat-. mg said pawl Into engagement with one orthe other of said opposed drlvers, and means for checking the rotative movement of said pawl about said driving shaft upon the reversal of the direction of rotation of the driving shaft.

3. In a hoist, the combination of a frame, a driving shaft, two drums rotatable about said driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by said drums respectively, a main driver connected to be rotated by said driving shaft, a pawl carrier rotatable about said driving shaft; a pawl pivoted on said pawl carrier and interposed between the main driver and the drivers carried by the drums for automatically connecting said main driver to one or the other of said opposed drivers in accordance with the direction of rotation of the driving'shaft, positive means independent of said opposed drivers for rocking said pawl about its pivot into engagement with one or the other of said opposed drivers, and means for retarding the movement of said pawl carrier upon the reversal of the direction of rotation of the driving shaft to enable said pawl to be positively moved into engagement with one or the other of said opposed drivers.

4. In a hoist, the combination of a frame, a driving shaft, two drums rotatable about said driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by said drums respectively, a main driver connected to be rotated by the driving shaft, a pawl carrier rotatable about said driving shaft, a transversely rocking pawl having a recess pivoted to said pawl carrier for automatically connecting said main driver to one or the other of said opposed drivers in accordance with the direction of rotation of the driving shaft, positive means independent of the opposed drivers for actuating said pawl into engagement with one or the other of said opposed drivers, said positive means including a cam connected to said main driver and extending into the recess in said pawl, and friction means for retarding the movement of said pawl carrier upon the reversal of the direction of rotation of said driving shaft.

5. In a hoist, the combination of a frame, a driving shaft, a motor connected to operate the driving shaft, two drums rotatable about the driving shaft, a main driver connected to be driven by the driving shaft, a pawl carrier rotatable about said driving shaft, a transversely rocking pawl carried by said carrier for automaticallyconnecting said main driver to one or the other of said drums according to the direction of rotation of the driving shaft, and positive means for actuating said pawl into engagement with one or the other of said opposed drivers and adapted to transmit the entire driving power of said main driverdirectly to said pawl.

In testimony whereof I have signed this specification.

EARL B. LEAR. 

